MK-8245

SCD1 enzyme activity assay

The potency of MK-8245 against the stearoyl-CoA desaturase was determined by measuring the conversion of radiolabeled stearoyl-CoA to oleoyl-CoA using rat liver microsome or human SCDl (hSCD-1). Liver microsome was prepared from male Wistar or Spraque Dawley rats on a high carbohydrate diet for 3 days. The livers were homogenized (1:10 w/v) in a buffer containing 250 mM sucrose, 1 mM EDTA, 5 mM DTT and 50 mM Tris-HCl (pH 7.5). After a 100,000 × g centrifugation for 60 mins, the liver microsome pellet was suspended in a buffer containing 100 mM sodium phosphate, 20% glycerol, 2 mM DTT and stored at -78 °C. The human SCDl desaturase system was reconstituted using human SCDl from a baculovirus/Sf9 expression system, cytochrome B5 and cytochrome B5 reductase. Typically, different concentrations of MK-8245 in 2 μL DMSO was incubated for 15 mins at room temperature with 180 μL of the SCD enzyme in a buffer containing 100 mM Tris-HCl (pH 7.5), ATP (5 mM), Coenzyme-A (0.1 mM), Triton X-100 (0.5 mM) and NADH (2 mM). The reaction was initiated by the addition of 20 μL of [3H]-stearoyl-CoA (final concentration = 2 μM, radioactivity concentration = 1 μCi/mL). After 10 mins, the reaction mixture (80 μL) was mixed with a calcium chloride/charcoal aqueous suspension (100 μL charcoal (10% w/v) plus 25 μL CaCl2 (2N)). After centrifugation to precipitate the radioactive fatty acid species, tritiated water released from 9,10-[3H]-stearoyl-CoA by the SCD enzyme was quantified on a scintillation counter.

Cell lines

Rat hepatocytes

Preparation method

The solubility of this compound in DMSO is > 10 mM. General tips for obtaining a higher concentration: Please warm the tube at 37 °C for 10 minutes and/or shake it in the ultrasonic bath for a while. Stock solution can be stored below -20 °C for several months.

Reaction Conditions

＜ 200 nM

Applications

In the rat hepatocyte assay which contains functional and active OATPs, MK-8245 significantly inhibited SCD with an IC50 value of 68 nM.

Animal models

eDIO mice

Dosage form

3, 10 or 30 mg/kg; p.o.

Applications

MK-8245, a liver-targeted small molecule SCD inhibitor, improved whole body insulin sensitivity.

Other notes

Please test the solubility of all compounds indoor, and the actual solubility may slightly differ with the theoretical value. This is caused by an experimental system error and it is normal.

References:

[1]. Oballa RM, Belair L, Black WC, Bleasby K, Chan CC, Desroches C, Du X, Gordon R, Guay J, Guiral S, Hafey MJ, Hamelin E, Huang Z, Kennedy B, Lachance N, Landry F, Li CS, Mancini J, Normandin D, Pocai A, Powell DA, Ramtohul YK, Skorey K, S?rensen D, Sturkenboom W, Styhler A, Waddleton DM, Wang H, Wong S, Xu L, Zhang L. Development of a liver-targeted stearoyl-CoA desaturase (SCD) inhibitor (MK-8245) to establish a therapeutic window for the treatment of diabetes and dyslipidemia. J Med Chem. 2011 Jul 28;54(14):5082-96.